diff --git a/tox.ini b/tox.ini
index 03993b177..cbac1dc17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,13 +2,12 @@
 envlist = py36
 
 [testenv]
-passenv = PMG_MAPI_KEY GULP_LIB COVERALLS_REPO_TOKEN CIRCLE* PYTHONPATH
+passenv = PMG_MAPI_KEY GULP_LIB COVERALLS_REPO_TOKEN CIRCLE*
 deps =
     nose==1.3.7
     coverage==4.4.1
     coveralls==1.1
     -r{toxinidir}/requirements.txt
-;    -r{toxinidir}/requirements-optional.txt
 usedevelop=True
 commands =
     py36: nosetests --config=nose.cfg --cover-html --cover-html-dir=$CIRCLE_ARTIFACTS